FR2611766A1 - BITUMINOUS EMULSION SPREADING DEVICE ON THE SURFACE OF A ROAD WITHOUT TRUCK TRAFFIC ON THE HANGING LAYER MADE BY EMULSION SPREADING - Google Patents

Abstract

1. Device for spreading a bituminous emulsion over the surface (1) of a road in order to constitute a bonding layer (3) prior to the deposition of a layer (2) of hot bituminous road surfacing material by a finishing machine (5), this device comprising a chassis (15) and a means of movement (16) which is independent of the finishing machine (5), characterised by the fact that it comprises a device for receiving the hot road surfacing material (18) mounted on the chassis (15) at the front, a device for transferring the road surfacing material (19, 21) positioned behind the receiving device (18), over the length of the chassis (15), having a discharge end (22) located at the rear of the chassis (15), a tank for containing bituminous emulsion (25) with a capacity at least equal to two cubic metres and a boom (26) for spreading the emulsion over the road, being supplied by the tank (25) and positioned transversely at the rear of the chassis (15).

Description

The invention relates to a device for spreading

  dage of bituminous emulsion on the surface of a road

  te, for the creation of a bonding layer

  prior to the deposition of a layer of bituminous mixes

hot knots by a finisher.

  For construction, maintenance or repair

  road or road pavement, it may be necessary

  be sure to deposit a layer of hot bituminous mix on an existing layer of the roadway. For

  ensure good adhesion of the two superposed layers

  it is necessary to spread a bituminous emulsion on the surface to be covered before

  deposition of the hot mix layer.

  Traditionally, the spreading of the bituminous emulsion was carried out on the layer to be covered previously scanned, by a machine

  comprising a tank and a spreading ramp. The-

  muision exposed to ambient air then underwent a

  more or less long chage during which the emulsion ruptured. Applying the coat

  of hot mixes and its compaction were then ef-

  carried out using a conventional finisher

  operated by trucks from a power plant

  bage and a compaction roller working at the

following the finisher.

  More recently, a method has been proposed for applying a bonding layer prior to the deposition of hot mixes on the surface of a road in which the deposition of hot mixes is carried out.

  immediately after spreading the emulsion layer

  if we. In this way, the drying and the breaking of the emulsion are carried out in a very short time, by contacting the hot mixes. The boiling of the water contained in the emulsion, under the effect of the heat of the coated materials whose temperature is above 150 ° C., causes dispersion of the bitumen contained in the emulsion, as well in the layer on which the deposition is carried out only in the layer of hot mixes, in the vicinity of the junction surface between these two layers. This results in better adhesion of the hot mixes on the sub-layer. To implement this method, a conventional paver is used fitted with emulsion spreading ramps arranged over the entire width of the road, between the hot asphalt receiving hopper located at the front of the paver and the spreading device.

  mixes located at the rear of the paver.

  Such a device can therefore be supplied with

  its front part in hot mixes, by

  minions who are never required to move on the

bonding layer.

  However, such a device has

  disadvantages and in particular the adaptation of ram-

  spreading weights on the finisher and setting the

  bit of these ramps depending on the speed of the finish

  require the use of additional organs

  res which considerably complicate the design of the paver. In addition, it is not possible to place on the finisher, for reasons of space and available power, an emulsion tank having a significant capacity. The autonomy of the device is therefore low and it is not possible to ensure a

  continuous operation for a long time.

  This autonomy is further reduced by the fact that the reserve of hot mixes available in

  the receiving hopper and on the finishing conveyor

  sor is relatively small, so the finisher

  may run out of asphalt if it supplies

  trucks are not insured on a regular basis. Downtime consecutive to this

  shortage of asphalt mix can be

  mulate with the stops necessary for emulsion replenishment since these stop periods do not

do not necessarily coincide.

  It may therefore seem desirable to return to the use of an emulsion spreading machine

  independent of the paver, as in the an-

  this. However, such a machine used in front of the finisher would prohibit supply

  of the asphalt paver. during his function-

  ment. None of the known spreading machines ac-

  only allows rational use of a

  paver for depositing a layer of bituminous mixes

  hot knots on a road, with the interposition of a

bonding layer.

  The object of the invention is therefore to propose a device for spreading bituminous emulsion on the surface of a road, for the constitution of a

  bonding layer. prior to the deposit of a

  of hot bituminous mixes by a paver, including

  carrying a chassis and independent rolling means

  finisher and allowing rapid use

  completely continuous process of the paver, in a process in which the deposit of hot mixes is

  made immediately after spreading the emulsion

  bituminous and in which the supply trucks

  asphalt mixes are not required to circulate

on the bonding layer.

  To this end, the spreading device follows

  vant the invention comprises, mounted on the chissis, a device for receiving hot mixes i its front part, a device for transferring the mixes arranged following the reception device over the entire length of the chassis having a discharge end located at the rear of the chassis, a bituminous emulsion tank with a capacity at least equal to two cubic meters and an emulsion spreading ramp on the

  road supplied by the reservoir and placed transversally

also at the rear of the chassis.

  In order to clearly understand the invention,

  we will now describe, by way of nonlimited example

  tatif, with reference to the attached figures, an embodiment of a spreading device

of emulsion according to the invention.

  Figure 1 is a schematic view in ele

  vation and partial section of a set of coverings

  ment of a roadway with a spreading device

dage according to the invention.

  Figure 2 is a side elevational view

  the and in partial section of a spreading device

of emulsion according to the invention.

  Figure 3 is a top view along 3

in Figure 2.

  Figure 4 is a rear elevation view

  of the spreading device, according to 4 of FIG. 3.

  FIG. 5 is a diagrammatic representation

  as the emulsion tank, the spreading ramp

  and the emulsion supply circuit of a device

tif according to the invention.

  In FIG. 1, we see the surface 1 of a road, on which a layer of hot mixes 2 is deposited, with the interposition of a bonding layer

3 bituminous emulsion.

  The entire system shown in the

  figure 1 moves in the direction of advancement of the

261,176

  tier (arrow 4) and includes a finisher 5, a dispo-

  emulsion spreading agent according to the invention 6 and

  a truck 7 allowing the supply of finis-

  sor 5 in hot mixes, via the

positive spread 6.

  The finisher 5 comprises, in a conventional manner

  that a chassis supported by tracks 8 on the

  which rests a hopper for receiving hot mixes 9, a motorization and control assembly 10

  comprising a driving position, a roller conveyor

  hot mixers 11 and a mix spreader 12.

  A table 13 for smoothing the layer of

  are placed behind the spreading device 12. We will now refer to Figures 2,

  3 and 4 to describe the device 6 for spreading water

emulsion according to the invention.

  The device comprises a chassis 15 carried

  by tracks 16 and comprising, at its front part

  upper, a push bar 17 provided with rollers on

  which support the wheels of the ravi-

asphalt cutter 7.

  The chassis 15 carries, at its front part, a hot asphalt receiving hopper 18 and, at the

  following the hopper 18, over its entire length, a

  mix transfer positive 19 comprising a

  conveyor 20 with chain and steel bars and an element

  support 21 arranged following the conveyor 19, the end part of which constitutes a discharge hopper

22.

  The elevator 21 has two * chains without

  end 23 on which are fixed pallets of

  lifting 24 for transporting hot mixes from the outlet of the conveyor 19 to the hopper of

  spill 22 located at the rear end of the dispo-

  sitive 6 and above the receiving hopper 9 of the finisher, when the device is in operation

  on site, as shown in Figure 1.

  The chassis 15 of the device 6 also carries, in its middle part, an emulsion tank

  whose capacity is 10 m3. This tank includes

  carries means for reheating the emulsion and

  distribution which will be described, with reference to the fi-

gure 5.

  The reservoir 25 makes it possible to supply a set of

  emulsion spreader 26 fixed at the back and at

the lower part of the chassis.

  The spreading device 26 is constituted by a central ramp 26a fixed on the frame 15 and by two lateral ramps 26b and 26c mounted mobile

  in the transverse direction (arrow 27 on the fig-

  re 3), on the central ramp 26a. The displacement of

  lateral ramps 26b and 26c allows the width to be modified

  geur of the zone of action of the device 26, as a function of the width of the roadway to be covered. The ramps 26a, 26b and 26c are provided with spray nozzles 28

  directed downwards and distributed at short distances

  gulières, along the length of the ramps. However, the ramp 26a does not have a nozzle in two zones 26 'arranged along the length of the ramp, in the

  extension of the tracks 8 of the paver 5.

  This avoids any contacting of the tracks of the finisher 5 with the previously deposited emulsion layer. The finisher 5 has, at its rear, two small ramps located in the

  extension of the tracks 8 and immediately a-

  front of the spreading device for asphalt 12. Such

  complementary ramps, of short length and therefore

26 1 1766

  with a low emulsion flow rate, can be supplied from a small emulsion tank carried by the

  finisher or from the tank of the water spreader

mulsion, by a flexible pipe.

  The central ramp 26a is connected to the chassis

  via a carriage 29 mounted on ga-

  lets, motorized, possibly allowing a displacement-

  alternatively reduced and adjustable amplitude of the ramps, in the longitudinal direction of the chassis 15. The carriage 29 is provided with a screw-nut or similar system for adjusting the height of the ramp 26a by

report to the ground.

  The chassis 15 also carries at its extremi-

  rear tee two flanges 30 parallel and arranged there-

  on the sides of the chassis 15 comprising

  openings 31 opening backwards into which

  we can introduce the ends of the axis 33 of a spool of textile material 32. The spool 32 is thus rotatably mounted between the flanges 30, which makes it possible to unwind a sheet of textile material 34 of great width on the surface of Route 1, between the tie layer deposited by the ramps 26 and the

  asphalt layer deposited by the paver 5.

  The sheet of textile material 34 is guided along its path and kept in tension, thanks to

rollers such as 35 and 36.

  Textile roller 32 is slightly

  braked in rotation to maintain permanent tension

fabric.

  The textile unwinding device consists of simple roller axle supports. The unwinding is ensured by the forward traction of the

emulsion spreader.

  On either side of the elevator 21, the chassis 15 carries a motorization assembly 40 and a

  cockpit 41 comprising all of the controls

  machine and driver's seat.

  The motorization assembly 40 is composed of a heat engine and of control and

hydraulic transmission.

  The transmission of the movement to the tracks 16 of the machine is of the hydrostatic type, which allows the feed speed to be easily adjusted to a low value, perfectly constant and perfectly determined. We can thus adapt the speed of advance

  of the emulsion spreading device on the site.

  at the speed of the finisher. Finisher 5 and dis-

  positive spread 6 are in fact connected by no mechanical connection and include means for

  fully independent motorization.

  On the other hand, when a truck such as the

  truck 7 comes to present in supply position-

  of the hopper 18 of the heat spreading device

  mulsion, the push bar 17 comes into contact with the rear tires of the truck 7 and the spreading device 6 ensures the movement of the truck by pushing.

  The motorization of the active elements of the device

  positive spreading, such as conveyor 19, ele

  valve 21 and the emulsion distribution pump are controlled by hydrostatic transmission from

the power unit 40.

  In this way, the asphalt rates and

  emulsion can be set at proportional values

  at the speed of progress of the site.

  In Figure 5, we see tank 25 rem-

  plaice of emulsion 42 which is maintained at temperature by a heating tube 43 in which circulates

  hot air, for example supplied by a burner 44.

  Two pipes 46 and 47 communicate with the internal volume of the tank at its lower part and at its upper part respectively. On the line 46 is placed a variable speed positive displacement pump 45. The lines 46 and 47 are connected to each other and to the ramps 26a, 26b and 26c by means of a

three-way valve 48.

  Depending on the position of the valve shutter, it is possible to circulate the emulsion in a closed circuit to ensure its mixing or to send the emulsion into the ramps 26a, 26b, 26c which ensure the distribution of the emulsion through to the nozzles 28. The spreading ramps are connected, downstream of the three-way valve 48, to a pipe 49 in communication

  with a container of compressed air 51, through

  section of a shut-off valve 50.

  After stopping the spreading machine, it is thus possible to purge the ramps 26a, 26b, 26c and the nozzles 28, by sending air

  compressed in these ramps by opening the valve 50.

  We will now describe, with reference to all of the figures, the operating mode of the

device according to the invention.

  As can be seen in Figure 1, a

  truck 7 supplying hot mixes (i.e.

  that is to say at a temperature close to or higher than 'C) is placed at the front of the spreading device 6 which then ensures its displacement by pushing at its advance speed on the site. The bucket of the truck 7 is inclined so as to pour the hot mixes into the hopper 18 of the spreading device 6 which is similar to the hopper 9 placed at the front of the paver 1 0

  5. The hot mixes are transported by the convo-

  yor 20 and the elevator 21 to the hopper 22 which

  on their continuous dumping in the hopper

  ception 9 of the paver 5. The conveyor 11 of the paver provides continuous transport of hot mixes to

than the spreading device 12.

  Simultaneously, the ramps of the whole

  spread 26 ensure distribution and distribution

  tion of the emulsion on the surface 1 of the road, at a location just in front of the finisher 5. The sheet of textile material 34 is immediately applied to the emulsion layer which has just been deposited by the

nozzles 28 of the ramps.

  The nozzles 28 project the emulsion onto the

  road surface 1, in the form of flat jets joined-

tifs and without overlapping.

  The hot mixes 52 are spread by the device 12, so that they come into contact with the upper surface of the textile sheet 34 itself in contact with the bonding layer 3

constituted by the emulsion.

  The heat of the coated material 52 produces a very rapid drying and breaking of the emulsion, the water of which boils on contact with the coated materials.

  150C. This boiling produces a dispersion of the bi-

  emulsion tume in the road underlay 1

  and in the asphalt layer 2, which provides

  effective spitting of the asphalt layer on the road.

  It should be noted that the sheet of tex-

  tile 34 does not hinder heat exchanges between the mix and the emulsion layer and the dispersion of

bitumen in the junction area.

  We were able to use the device according to the

  vention for spreading bonding layers from 1 1 0.2 to 0.8 kg / m, the speed of advance of the device and of the finisher on the site being between 4 and 8 m / min. As indicated, the assay is carried out by the

  positive displacement pump 45 whose speed is proportional

  at the speed of advance of the spreading device.

  In the case of the highest dosages, i.e.

  say in the case of an emulsion layer of 0.6 to 0.8 kg / m2 the speed of the spreading device being 6 to 8 m / min, the spreading is carried out continuously, as

it has been described.

  For the lowest dosages, and in particular

  when the quantity of emulsion is around

  0.2 kg / m, it is preferable to carry out the spreading

  dage discontinuously. The spreading ramps

  have a movement in the longitu-

  of the device. Simultaneously, the speed of a-

  advancement of the device is adjusted to achieve a

  sequence allowing spreading by transverse bands

successive sales.

  The device according to the invention has the advantage

  to allow the implementation of a process o

  hot mixes are deposited on the additive layer

  chage very quickly after application on the

  road, while using a classi-

  than. In addition, the autonomy of the device is considered

  significantly increased, since the emulsion tank carried by a chassis completely independent of the paver can have a large capacity. In addition, the autonomy of the device is also increased by the fact that a reserve of hot mixes is present in the transfer device of the emulsion spreader, after the unloading of a truck. This reservation allows the

  minimum to double the reserve contained in the provision

finisher transfer.

* The invention is not limited to the mode of

which has been described.

  This is how we can foresee on the dispo-

  spreading sitive, an emulsion tank of a capacity

  city different from 10 m This capacity will however preferably be between 5 and 10 m3 and, from

  anyway, greater than 2 m3, to ensure self-

  sufficient names of the device on site. In the case where the capacity is greater than 5 m, we must

  provide a device for reheating the emulsion.

  The asphalt transfer device

  placed along the length of the emulsion spreader

  sion could be realized in a different form

from that which has been described.

  The emulsion spreading ramps may have a different shape and a different distribution than

those that have been described.

  We can also provide a continuous ramp

  bare but not having nozzles in the areas

  located in the extension of the tracks of the finis-

  a ramp interrupted in these areas.

  The spreading device according to the invention

  tion can be mounted on tracks or on

  wheels. This device can be self-propelled or its

  placement can be ensured by pushing, thanks to the

  nisseur. The device for transferring hot mixes placed along the length of the emulsion spreader can be simplified and the receiving hopper eliminated, in the case where the supply of mixes is ensured by a bead picker. In this case, the device

  spreading emulsion will preferably be meca-

finisher only.

2 6 1 1 7 6 6

  It is also possible to attach to the re-

  pandeur d '& émulsion a floating asphalt smoothing table. In this case, the spreader finisher

coated is no longer necessary.

Claims (12)

  1.- Bitu emulsion spreading device   miner on the surface (1) of a road, for the cons-   titution of a bonding layer (3) prior to the deposition of a layer (2) of hot bituminous mixes by a paver (5) comprising a chassis (15) and rolling means (16) independent of the paver (5) characterized in that it comprises, mounted on the chassis (15), a device for receiving asphalt   hot (18) at its front, a transfer device   mix of asphalt (19, 21) placed after the provision   reception sitive (18), over the entire length of the chassis (15), having a discharge end (22)   located at the rear of the chissis (15), a fuel tank   i5 bituminous emulsion (25) with a capacity at least equal to 2 m and a ramp (26) for spreading emulsion on the road supplied by the reservoir (25) and placed   transversely to the rear of the chassis (15).   2.- Spreading device according to the re-   vendication 1, characterized by the fact that the   see bituminous emulsion has a capacity between 5 and 10 m 3. Spreading device according to one   any of claims 1 and 2, characterized by   the fact that the transfer device (19) of the windings   bés comprises a substantially horizontal conveyor (20) and an inclined elevator (21) terminated by a hopper of spill (22).   4.- Spreading device according to one   any of claims 1, 2 and 3. characterized   by the fact that it comprises a motorization assembly (40) constituted by a heat engine and means   hydraulic control and transmission5 for   rer advance at a set speed on site.   5.- Spreading device according to one   any of claims 1 to 4, characterized by   the fact that the emulsion spreading ramp (26) has a central part (26a) connected to the chissis (15) and two lateral parts (26b, 26c) mounted movable in the transverse direction relative to the central part, for the width adjustment of the spreading ramp (26).   6.- Spreading device according to one   any of claims 1 to 5, characterized by   the fact that the emulsion spreading ramp (26a)   has two zones (26 '), extending along its length   in which the spread of emulsion is not not realised.   7.- Spreading device according to one   any of claims 1 to 6. characterized by   the fact that the spreading ramp (26a) is connected to the   chissis (15) by means of a moving carriage (29)   torized, allowing an alternative and adjustable movement   ble of the ramp (26a), following the longitudi- nale of the chissis (15).   8.- Spreading device according to one   any of claims 1 to 7, characterized by   the fact that the bituminous emulsion tank (25)   comprises a means for heating (43) the emulsion.   9.- Spreading device according to one   any of claims 1 to 8, characterized by   the fact that the spreading ramp (26) is connected by a pipe (49) to a compressed air tank (51), by means of a valve (50) to purge the ramp (26) , after stopping the device of spreading.   10.- Spreading device according to one   any of claims 1 to 9, characterized by   the fact that it has, at its front, a means   (17) pushing a truck (7), to ensure the supply   viewing of hot mixes (52) of the   reception (18), at the front of the retaining device   pandage. during its progress on the site. 11.- Spreading device according to one   any of claims 1 to 10, characterized by   the fact that it includes a device (30_ 32, 33, 35,   36) unwinding and application of a tex tablecloth   tile (34), at its rear, in front of the paver (5). 12.- Use on a road construction site of a spreading device according to any one   of claims 1 to 11, in combination with a card   bit of asphalt supply (7) and a finishing   emitter (5), the emulsion spreading device (6) being placed at the rear of the truck (7) and at the front of the   finisher (5) in the direction (4) of advancement of the   road trailer, so that the asphalt receiving device (18) can receive asphalt from the truck   (7). and that the discharge end (22) of the device   coating transfer agent (19, 21) ensures the de-   pouring of asphalt (52) into the receiving hopper (9) of the finisher (5).